First, read the PDP-8/E Operating Notes.
Next, load the following program into the PDP8/E and run it. The program starts at address 0200, and expects the switch register to contain some number N at the time execution begins. The program computes some number, depending on the value of N, and puts the computed number into the accumulator before halting.
Your assignment is (1) to figure out what this program does, and (2) to comment the code. Your comments should identify the main conceptual blocks of the code and describe what those blocks do. You should also explain the overall result this program computes.
I recommend that you run the program a few times with a variety of small values of N. You should start to recognize a pattern.
Feel free to work with a partner.
Addr Instruction 0200 7301 CLA CLL IAC 0201 3224 DCA B 0202 3223 DCA A 0203 7404 OSR 0204 7550 SPA SNA 0205 5220 JMP END 0206 7041 CMA IAC 0207 3225 DCA C 0210 1223 LOOP, TAD A 0211 1224 TAD B 0212 3223 DCA A 0213 7005 IAC RAL 0214 1224 TAD B 0215 3224 DCA B 0216 2225 ISZ C 0217 5210 JMP LOOP 0220 7200 END, CLA 0221 1223 TAD A 0222 7402 HLT 0223 0000 A, 0000 0224 0000 B, 0000 0225 0000 C, 0000